/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.engine.impl.cmd;

import com.je.bpm.engine.impl.Page;
import com.je.bpm.engine.impl.asyncexecutor.AcquiredJobEntities;
import com.je.bpm.engine.impl.asyncexecutor.AsyncExecutor;
import com.je.bpm.engine.impl.interceptor.Command;
import com.je.bpm.engine.impl.interceptor.CommandContext;
import com.je.bpm.engine.impl.persistence.entity.JobEntity;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

/**
 * 获取工作命令
 */
public class AcquireJobsCmd implements Command<AcquiredJobEntities> {

    private final AsyncExecutor asyncExecutor;

    public AcquireJobsCmd(AsyncExecutor asyncExecutor) {
        this.asyncExecutor = asyncExecutor;
    }

    @Override
    public AcquiredJobEntities execute(CommandContext commandContext) {
        AcquiredJobEntities acquiredJobs = new AcquiredJobEntities();
        List<JobEntity> jobs = commandContext.getJobEntityManager().findJobsToExecute(new Page(0, asyncExecutor.getMaxAsyncJobsDuePerAcquisition()));
        for (JobEntity job : jobs) {
            lockJob(commandContext, job, asyncExecutor.getAsyncJobLockTimeInMillis());
            acquiredJobs.addJob(job);
        }
        return acquiredJobs;
    }

    protected void lockJob(CommandContext commandContext, JobEntity job, int lockTimeInMillis) {
        GregorianCalendar gregorianCalendar = new GregorianCalendar();
        gregorianCalendar.setTime(commandContext.getProcessEngineConfiguration().getClock().getCurrentTime());
        gregorianCalendar.add(Calendar.MILLISECOND, lockTimeInMillis);
        job.setLockOwner(asyncExecutor.getLockOwner());
        job.setLockExpirationTime(gregorianCalendar.getTime());
    }
}
